Machine for grinding files.



w. H. DENLEY & B. MAKIN. MACHINE FOR. GRINDING FILES.

APYLIOIATIO-N I'ILED SEPT. 25, 1 913.,

Eat m d Mar. 16, 1915;

2 SHEETS-SHEET 2.

' ATro/ ne' y HENLEY and r'innreatrn MAKIN, subjects of.

Specification of llsttcrs Patent.

Patented Mar. 16,

simplification filed September as, 1913. serial it o. '?91,981.

re uZZ vlwm ttmuycmwera: I

Be it known that we, Wnnmnr lrnnnr Tthe :King-of Great Eritainfresiding. at-378 ltl oseley road, Birmingharm -England, and

Atterclifi'e Steel Works, Shefield, England, -respectively,:have invontedanevv and useful.

Machine for tirinding Files; and We do hereby declare th s :iolloiving to be a full,

clean-and exactdescriptionof the same.

Qur invention relates to apparatus for grinding the mother files-and refers to that :olass xof such machines in Which-the file 1s scaiiried by a slide .or carrierand in Which the grinding Wheel is adapted to be travi'ersed across the file, and-has forfits object \toiprovidemeans for resharpening orzgrindling files of the "type which are provided with ;parallel" milling teethafter they have been :cut 'or used; the invention being particularly applicable to the file described in the prior -EBritish'spec1fic'ation No. 12592 i A. D. l9l0of William Henry Denley.

Apparatus made in accordance with our invention eomprises a bed plate, a table adapted to he fixed thereto m angular positions corresponding with the angle of the Iteeth tobegroundiand along Which-is moved ,aslidinghead in which is mounted aspindle carrying the grinding wheel, means for driving thets'aid spindle, a slide or carrier I upon which the file may bee-clamped, and

:means for successively advancingthe carrier relatively to the grinding wheel after each tooth :hasbcen ground.

Referring to thedrawingsz-Figure l is p a plan of a machine constructed in accord ance-With the present invention. Fig. '2 is a front elevation of-same. Fig.-3is o. section at A-B in Fig.2. =Fig. 4-illustrates the means for automatically advancing the file after each tooth has been ground. Fig. 5 illustrates the means 1for compensating for any-inequalities which there may be in the surface of the file.

carrying our invention into practice-as illustrated upon the accompanying draW-.

hugs, the grinding wheel 1 is carried by a spindle 2 supported in a head 3, said spindle having a pulley whereby it is-driven. The .head is slidably' supported upon the table 5 which is-adaptcd to be *fixedto a bed plate in angular positions corresponding with the anglepf the teeth to be ground, by suitable bolts passing through the holes 6. When the medium of a lever, or in any. other suitable manner.

The file 7 is clamped upon a slide 8 Which moves cndvvise upon the frame 9,-the irame being provided with a suitable guide member'lO. The clamping means includes an abutment 11 and a movable jaw 12 Which is operated by a handle 13 engaging a screw 14: in combination with a peg l5 and adjustment screws 16 which enable the clamping device to be used for files of diiierent Widths. Adjacent to and forming part of this slide 8 is a master rack 17 having teeth out upon it corresponding in form and pitch with the. teeth of the file which is being ground, and carried by the slide is a pivoted arm .18 having a hooked end 19 which is adapted to be brought into engagementwith the first tooth on the file Whensetting the file in the machine, thereby insuring that the position of the file shall exactly register the master "rackl Means are provided for advancing thefile one tooth after'each tooth has been ground, such means including a pivoted arm- 20 tooth into position for grinding. An ad justment screw-23 is provided so that each lt'ull depression of the lever 22 can be arranged to advance the file the required dis tance, and which distance maybe varied when desired for use with files of different pitch, the parts being returned to their initial position by the spring 24.

The master rack 'is detachable and one of such racks will be cut for each pitch of file which is to be ground, being provided with corresponding teeth.

The machine is particularly intended for regrinding teeth on files Which have become blunt by use.- It is found that in practice files sometimes become slightly bent in use,

head maybe efiected directly by hand, or through and the present machine therefore includes ground for its full depth with files or are lerent thicknesses or on files which have become bent and the teethiconsequently of fer'ent heights. The table is therefore a 5 pable of a slight oscillatory movement about the spindle 25, the front end of which is provided withan arm 26 connected to a fixed member 27 by a screw 28 and wing-nut 29,

said'arm being normally held back by theinfiuence'of the spring 30. In practice the 'headand slide are given a slight pivotal movement'within the limits allowed by the screw and nut 28, 29, and spring 30.

' What we claim then is:

' 1. In a machine for grinding files, the

combination of a bed; a file carrier slidably supported upon the bed; a table mounted upon the bed; a slide movable along said' table; a grinding wheel rotatably supported upon said slide; means for traversing said grinding wheel across said carrier; means .for ad usting the angle of'said table to correspond with the angle of the teethacross the'file' to be ground; means for progres.

sively advancing the file relatively to the grinding wheel; and means for regulating the amount of. such advance movement to correspond with the pitch of the file and teeth. I I r 2. In a, machine for grinding files, the combination of a bed; a file carrier slidably supported-upon the bed; a table mounted upon the bed and adapted to be adjusted angularly relatively thereto to correspond with the angle of the teeth of the file to be ground; "a slide movable along said table; a grinding wheel rotatably supported upon said slide; a master rack having inclined teeth corresponding with the teeth upon the filesj to beground; means for initially po? sitioning the file relatively to the masterrack a transversely disposed shaft carried by said bed; an arm on said shaft; a pawl on :said arm engaging said master rack; a spring'forretracting the arm and pawl; a

lever carried by thesaid transversely. disposed shaftand adapted when actuated to.

' advance thefile relatively to the grinding wheel; means for regulating theamount of such advance movement to correspond with the pitch of thefile; and means for progressively advancing the file relatively to the grinding wheel for a; distance corresponding with the pitchof the file and master rack ' 3. In a machine for grinding files, the

' combination of a bed guides carried by said bed; a carrier slidably-supported upon said bed and guides; screw controlled meansfor said slide; a master rack having inclined clamping the file in position upon the car: rier; a table mounted upon the bed and" adapted to be adjusted angular-1y relatively thereto to correspond with the angle of the teeth of the file to be ground; a slide mov- 7O able along said table; a rotatable spindle carried by said slide; a driving pulley in saidspindle; a grinding disk also carried by said spindle and rotatable therewith; means for enabling the grinding wheel to be raised and lowered relatively to the file; a

master rack having inclined teeth corre 'sponding with the teeth upon the files to be v ground; means for initially'positioning the file relatively to the master. rack; a transversely disposed shaft carried by saidbed'; an arm onsaid shaft; a pawl on said arm engaging said master rack; a'spring for retractingthe arm and pawl; a lever carried by the said transversely disposed shaft 5 and adapted when actuated to advance the file relatively to the grinding wheel; and means for regulating the amount of such advance movement to correspond with the pitch of the file. j g. a

4:. In a machinefor': grinding files, the combination of a bed; a filecarrier slidably supported 1 upon the bed; a table mounted upon the bed" and adapted to-be adjusted angularly relatively-thereto to correspond with the angle of the teeth of the file to be ground; a slide movable along said table; a grinding wheel rotatably supported upon teeth corresponding with the teeth upon the 1 i file's'to be ground; means for initially posi- I tioning the file relatively, to the master rack; means engagingsaid master rack; means adapted when-actuated to advance the file, relatively to the grinding wheelthrough the means engaging the master rack; means for regulating the amount ,ofsuch advance movement to'correspond with the pitch of the file; and means for progressively advancing the file relatively to the grinding wheel for a distance corresponding withthe pitch of the file and master rack. v-

5; In a machine for grinding files, the combination of abed guides carried by said i bed;-a carrier slidably supported upon said bed and guides; screw controlled means for clamping the file in position upon the carrier; a table mounted upon the bed and adapted to be adjusted angularly relatively 12o thereto to correspond with the angle of the teeth of the filetobe ground; asli'de movable along said table; a rotatable spindlejcar- I ried by said slide;a"driving pulley in 'said spindle; a grinding disk also carried by said spindle and rotatable therewith and means i for enabling the grinding wheel tobe raised and lowered relatively to the'file.

v 6. In a machine for grindingfiles, the combination of means for holding said file 13 l mmw w q grinding ham- 11; mwmg mmtfmg 3mm 1m *mstimmy wherenf Wes ham si gflnding Wheel; means far EraveTs-ing said names $0 spgcificaitiun in gmlnding Wheel aem s the; file; Imam 1501 mm subscribing Witnesses.

adjusting the angle fij f, traversipg 1 5 'mkes place; an& wmpensaemg means 101 I AMEN NMKEN permitting Hm fmnt vemicai edge 0;? the v f fila tooth to b6 grmmd 'w ifJJS 1111 depbh with Wifmessw: I filesof iiifi m wickmasses 01" which. hm,- H mm F Fommsm become bent, EVAN L; 

